Hello. --- On Wed, 8/19/09, Дмитрий Замураев <gigabyte....@gmail.com> wrote:
> From: Дмитрий Замураев <gigabyte....@gmail.com> > Subject: Re: em driver input errors > To: alexpalias-bsd...@yahoo.com > Cc: freebsd-net@freebsd.org > Date: Wednesday, August 19, 2009, 7:27 PM > Hello Alex. > > What sheduler are you using? ULE or 4BSD > Have you NIC IRQ sharing with other hardware? > What HZ value? 1000? SCHED_ULE, HZ=1000: host# sysctl kern.sched.name kern.hz kern.sched.name: ULE kern.hz: 1000 host# > > Thanks for the suggestion. > > From a "clean" box: > > dev.em.0.rx_int_delay: 0 > > dev.em.0.tx_int_delay: 66 > > dev.em.0.rx_abs_int_delay: 66 > > dev.em.0.tx_abs_int_delay: 66 > > I reset all the values (errors still appearing), then > tried your suggestion (rx_int_delay=600, > rx_abs_int_delay=1000). This has reduced the number of > >interrupts for em0 (from about 7200/sec to around > 6500/sec). After some time, I started getting errors > again. > mmm, try the maximum value 67108, what hapens... I will try this today when there's enough traffic to see errors. > > But that has made me try this also: > > dev.em.0.tx_int_delay=600 > > dev.em.0.tx_abs_int_delay=1000 > I think it's a bad idea, but don't know because: > > Meaning using your suggested values for tx too. > Now em0 is seeing about 1800 interrupts/second, which is way > better, but after some time I saw errors >again... > > > From the output of "netstat -nI em0 -w 5": > maybe mistake, did you meen "netstat -w5 em0" ? Nope, exactly as in my mail, "netstat -nI em0 -w 5". It does take 5 seconds to produce meaningful output. > I have PPPoE concenrator based on S3000AHV motherboard with > Core2Quad 6600 and four (to load all cores in CPU) Intel > PCI-E x1 and PCI-E x4 NIC's > My load: Pretty impressive figures. And "netstat -ni" shows 0 errors on all cards? > And i have't any problems. I think i select the good > hardware. > > > Interrupts total (as reported by systat): around > 13500/second. I would estimate the old IRQ load at > around 30000-35000/second, which doesn't seem too >much > to me, for a dual xeon machine. > I think it depends by motherbord, what full hardware > specification are you using? with chips names The machine is a Dell PowerEdge 2850. According to its specs, the chipset is Intel E7520. Two 64-bit Xeon processors at 3.20GHz, 4 GB RAM. > > Speaking of which, I did compile the kernel with > "options DEVICE_POLLING", but enabling polling only made the > errors appear more often, and in greater >numbers. > I don't use polling on FBSD 7.x, it's usable on FBSD older > versions I tried as many possibilities as I could. > > - 1 x dual-port gigabit interface, PCI-X > Maybe I have this card. And it works unstable, i don't > remember what happens, but i seen by tcpdump "truncated IP, > missing XX bytes" Currently most errors are on the motherboard-embedded em0 interface. Second is embedded em1. Last are em2 and em3 which are on the dual-port card (em2 under 170k errors as opposed to 2.6M for em0, and em3 0 errors) > Good luck. Thanks! _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
